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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf05480df5f427a66c6b5fd8f46cd7577c08edbbfb03b27a14fe4455ee1da93' 
  AND token = 'fVzY9dqrYCtxe478dXu0ZFMVluyVNPY0zjNw577itLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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