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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '549c56040215a86e4839ce8f67ea43139b074e6097b4891c48ac9bdc935d63a4' 
  AND token = '0yZwu2PH35nVaOVEjN+HjPOPANeOrIq/7Ke4Wvep9Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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