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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88b2cb789d81c2f83b0c036feb85056958de347eb23a096e4e78e986c008477' 
  AND token = '/seZEI8RLQ2C67t5Ywz4iHuP4sUTGAkdU9nLIAq2Ycw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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