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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08cf329ff05d45e0a42dadd69901d803c720d207a9f50687b874f4c7b41b25f5' 
  AND token = '2bf7NpLTOrLViR6UnVXO7gWRHGjZE9G+wU3tgmv+Q28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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