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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e41b61b50989c50fbb22f74884b9d5990c79eb0572a3a81a962af765c8c689' 
  AND token = 'Jn9vUIBBlma2VFjZm1lI82bR1hXtCJtKu9MkOUa6uHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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