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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc926ea1fe60594657a763650f6a8473907706cf3279ae6c58737c22280c91f' 
  AND token = 'Ue3c9Cjuy3Sf85md5OmLJOUILHV1KVoeJDSW9Uj1llA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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