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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9a7811c331d863f94dbfd6eccf9f19447fc46f844306247c501fb67710975d' 
  AND token = 'c1c4F+uhKWTBk3TBnAW9W0JFWaTiVN50Jyy2m3XlUIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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