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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc93d93389463a5b8ddfb4da22a52c7043a4260f4e0408d3eee3bb1b679b710a' 
  AND token = '9cdvUqEDDkl2Zn6dgHoBzNxIlnJh4FfNUrBTtVzI1QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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