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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29585319adcc2b30383b59b8c57bbb6802ca2b68c8796e16969b6bf027a1c23' 
  AND token = 'Y6yBMiJ1Lw56DSqX8EUfvvEfCNr6qiIGWZPoTNPuE+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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