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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'accb587f870d20373cad241f67496696af633bdaedbcf23dbe694d2e9e3eabd8' 
  AND token = '/oKPCgV2ph9L3Ye1XrV5zQzoIiiPEOSQP8TF91IrfKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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