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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb674c27014a42e40499de7b2db7cf565285bdfe9af99549c9744e56ef2fd51' 
  AND token = 'G9OgVNwfFpWmukXOXLHxT8ldv7fsa8byEz88Y02GdeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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