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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8355c597e337b1c00c81bc81e043faf22cc7ac2f79b6c987db517f7b77e9cb13' 
  AND token = '2oSz/SY4jslxRatTDgOd359lBGS/eZSKag+oWs3sQf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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