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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9654ed13f542e7795bb88fff9cf21b7366e26371081697bd3fc23e385b93dd14' 
  AND token = 'iOpHLg5gkKDFGISS5nlRW0Zo9fQ+crz0BeAivaUuouA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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