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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b1eec35134a2b66ec5990c1b7d0321c32be3955d820911c83cc5734377cba1' 
  AND token = '6AEw+zaxuaw4HA6YrXkqTG9no6F+ObcvYDzCkJlosF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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