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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb1c7bab7d9a1510f4a5dcf5296c23ddb1be22adf6d6224e920fbad3be7c263' 
  AND token = 'keAsHvXZhortmWKXRrgDFn66RQRdofmsnIBDcH9M6SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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