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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad02619e4cf7500dda8de946bf5711f25eff93c1f12616736b3fabb4fbd9c99' 
  AND token = 'TM0C4tGOe33uZNETHW3lM9FPb/aqv7K/kusbe2GXFXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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