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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef69f2659112cf011969c573ceb3702e0d167d36ae4f6fd2c6e9768ceb6a979' 
  AND token = 'WCvLO228VJSAe6bMaTTwHQltwcWmj86xmflGIU2qPD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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