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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea4eaf6c90e4ba79ed12d496630bc3b7d8b040c5814316f83719a877a4c8f0c' 
  AND token = 'Nk90c1hdx2dW+H4mNrpj07RgshNOmBgVlOKQAUkgTMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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