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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c499bca67d9b9bc68a7a46a721c71bc876d53776661a36e414caf087923408' 
  AND token = 'k1RoFlDpyV1utNWv98q/9L72e4m+hO17NlY1vKu/3Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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