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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312fdf6f21368ddc06ad704b53f3822277ffd6cb1b7bf65dbb28f9a97b620ff6' 
  AND token = 'dnJxk5iWH+o1I5R9BdwrlK9tiJN8VjLbL7fKdyvui9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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