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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94070c17f16c26da1ea947978492a93cb06ba214010027b51534e2764ed202c' 
  AND token = 'YhWO+pfI4F9OjkTveTDgJ7bvX+RouMiAKcdm6fQJhtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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