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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853e06c283f8ba037fca36f9b561d46a83bf45a4b455e198d1c414882c7dc6db' 
  AND token = 'UB92ykUhYG67hVu7Oide9wqsxcCEi70qQRf6ns8DpwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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