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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1822503291d247cb8d7d7f2f57b9b1f564385cfdddab86c229ad2ef90f8742f' 
  AND token = 'S/K7IF/C49gkFXfr6312hf0z/S9yMqrW4UOgWqMZLgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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