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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '916f0de97edd805f646d5159c5e75f8d43bdd167d88acc4824e851eee449d663' 
  AND token = 'OUE4/AE+hx6F3+3HIzpHrbdtFvSOaxZj2urwjmWyu94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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