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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c032c94707044aa3dc11e9726a0259137821e67a6ca1cdd8bec8875b6ad224db' 
  AND token = 'LQHgS4P546T36gyyXMAo/5WjeFigpwNh86jEkGwqyZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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