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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79fd1609a79c2f05265b185a7771af054eb493a339898e860460b267e39ec304' 
  AND token = 'p4x1Tm0kf/7TCTCgrMMP5IJyDgcrtQeGcIXuT8Wmhd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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