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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7fe18c939fe776e8177cd7f4d337e6d81bf523cdc1f0e403771c1409cfd450' 
  AND token = 'vKlwWyc3p5mtf1v870HYyDrrsyp3j/Of6SH2ILUpew0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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