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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58c47f71f366c2e5317f4c0a3e3e1eb50cb93c227e22874c7550682326d87aa' 
  AND token = 'AVRoZ880e0vBZE6KkNi1OSKWz1dF2yNEeOxUXoMLGwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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