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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c2aca092889c8705a2780b6a8e48b5e405970636ff0c7ad2af4d1fb3d81351f' 
  AND token = 'BnmnkwXzQDea6PXHPuM+p71VQpXnuPvi4dQApHrGplU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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