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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4776ef9f18ab80417890aaf556eef99e5c1685328db070e6cc335550bd8213e3' 
  AND token = 'H8PjtuX8ww5of9b04NnveBlHJ+4rYUu98y0RRNPt51k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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