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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a10f08b9ec3dfe9d11191f57b87f4911bd14c9d9db9d4ee0913eb1e1b0e4574' 
  AND token = 'p6qanstiZiU/6MAOgMUIsJTMlDTMz9//D9pW2cn+G8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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