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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113b9b664345344225664db775e367914f6114b0a9be661a29ed6e1c1c9af0f3' 
  AND token = 'tYQhd7xrbb0JyLJ2IOfLqn7tOBa2cUCzOoG4VqZh3UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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