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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30048d63617a797b73394a4c7120d50ec921f2672ff2afb4f579cdc35883ea7e' 
  AND token = 'iF+9Gn7J6X0EPslIjHPHHwb2FHq0kN3OtkVrUelyI5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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