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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8438e99a6b1a35862691c15d451e5338f1875097f1191fb0422e4dcdfae01ddd' 
  AND token = 'mMD27aoWpJujFY763d2AiKlGPLa0u+4zeZR3JmE7wt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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