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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c53666022418cc0b5b928ebf32c3b95cc1b447548bb8fc673b220fe3c29dedb6' 
  AND token = 'V15zZejs07kRY9EEI8Fdm3KyTYV/N3DxgYFp2otYLVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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