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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7213d8c946dd59697048869570c9efd1e53dcc534f1701cd10170915ec4d84d5' 
  AND token = 'wL9LcRUXwsbh1yNCsJSfy8xakACneDpjGUYsw7XPfGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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