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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8cbf05f942671b16378ecccbe92235285c11ce7fd971659918709caf07739fa' 
  AND token = 'h/5+U9DYrz9GeBziyDSCkvuFQnMB36m0udgycDO7+X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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