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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98ea27cba0cc1c7860cc1ce523704be036d64801f0b95c15eb1c7d37b74b4e9' 
  AND token = 'lBQjUmGPRUZq4grgOT2T9eBC2ZezvkWHtA8QS58EWls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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