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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d8876205772a771cebcd1f0d59ad92b5875dbe73b474491df7ef62499aaf8b' 
  AND token = 'm+UZ7FyRup8+w2ifEby07ZuzPFt2JfTkhoSg0gcwQ0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}