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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '838d1c28173e2b09105c183872f6713d116dfd3d4a13d1e10bbf0e58d84dc4b9' 
  AND token = 'uxsmc61CUdm6pBic95IVbRpdOeaW+JPqIlmCKM0qL/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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