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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78a02695a9d89bf4a036b5e8ef9eb0e3da1eefb5c57894adb0809ef4c3cf26a5' 
  AND token = 'jIL5VKeXmK6rYc0G/HfhxE6nhM17smSv/bNxk6KNgfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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