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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3e9c3b8b2ca1d61c089ddfb257566f67bc3809e03af20e5f7cedba3b83ba0a' 
  AND token = 'p3hsqBgjuCDac0CmaD5BoU2WgwuPJbN3X49UlKFi5vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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