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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe264e61fa977f6353bfe43509cccf436c468fad581739c0f1ba0559c3ced22' 
  AND token = 'Ags5OJ6ITDCTFRdbIWnpaIyj7m4Y7JtKtdSrdhxQ+I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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