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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f79eb8493a31ca35d7906c98ad1996bc87a905a338856b5fde25ad966f76fe' 
  AND token = 'ITNiRtGD3scAWlDFiEGW2guEvOap3py5JegW1EtBml8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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