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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470216849a4f6199b401f0c645805388bd560337c013cf67e810076b1ab23102' 
  AND token = 'gecjaenR8RBTksbvY/aNjuL/L4EhSsx7OYZ+obcu9X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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