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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5fdf88301e530bbcf6bd62fa270e3e921d684c7d45a58a5d2d6dae7c3c862dd' 
  AND token = '1gLMRZtO5XGnOjO8gEh1molj3hkhqE0jMsrXsdOW15w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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