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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096c7f3522c31c49e8e446e0dd28b137be3fa4fb0bf1edcf697cf525b0597f88' 
  AND token = 'ijbTa+TZAmXtWMjSkRnO5SpOv+ut1iqMATNZUw9z5LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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