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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f852bcc78101f771b5b6a301c7452c5a4f2d2695ea513432084cc8b8db6b81bc' 
  AND token = 'kmgfNk+wJ0EXINzq6Eky4JtVZokaF4W1LhXvRNu+Hcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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