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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116c18ac1f61b10fd858125f72f3a019c893d6d54420e87bf5d46ae54592b479' 
  AND token = 'az/DU4aoR/8tPYPFEps0OhCg8I7LwgkfueWjpLvpCl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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