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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e871236f1e287e5668243adf1695a412b417023de2b35255c096b55e14ebd5d7' 
  AND token = 'r87AtDL/IMq0EX7uHp4wbTmWWnQrq9hmLooXpaLIKWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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