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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1d349a419381df19b314d68626b33a97512964a1b25f0d19af809eaafaab0c' 
  AND token = 'PqgJaEyKUS4JeMEJtpHye/fhT768mUEkLNbuuwg/EtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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