SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b61c7ffa74bcf2e10118883110aaa96344630f133db76840c9fe8ed965f9b6' 
  AND token = '+DOZRtVW5Zs+nXlKZQ2p3Onapmaw+/cpXrgkhvkUJxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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