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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c30e87c8a29b3fe557f7554c4481ae2725a0ee82b5d5e79cd2d164aa0b6627' 
  AND token = 'V7RnnhQsHOkf79+XIvHQDEtZ3wx9O42yd1ail+joNxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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