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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d61157eaa261dbe234a41780cd1b05843fc8f2d8de450679eb3f7a9259fcdd' 
  AND token = 'tbgiO3gZRLGIn/59tWnulqZCVq2bMz328In7AjA/q3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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