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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c65deb245f29981007ac546424e1585e28bdc5b9a20b68b5a1c0b94e67de3f' 
  AND token = 'belZ8sY4dhZbuNqk/AP3jLSnZJegES3H0ZCZSKEwdrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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