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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac173c0f9ce92be1c9808ce570d387ce7022dbc6c56b8e1e7a74bf0593c1082' 
  AND token = '2/sAdMykQEZVSyiZnnwayNCHswD6+St0MHthOc5WJh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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