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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf69baff8d90b4c00bab45134789e2c9e5318d1cc69d54e4ececbe6b5c013ab' 
  AND token = '6XYsioLhUF7oFAvicL3jlRRdVZn9Xnqr3EjBd9TvByg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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