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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e25a82d2ade13d8e3badd39d92949c0fab40d1d7ad1ab7449b3e0130c8743b' 
  AND token = 'lJLW/c4MWnF2DYfucs07PGOsB+UGdudEt3bb9rKcxFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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