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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf7c26731fd523dabef9be022a7ab67f303e75d919adb611bbbd28e21dcfb18' 
  AND token = 'YBvx3cwd510PJgWYo9lp0evSv+xDqHbFqn4oi5jtwLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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