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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a486ad24781a83fe855ccb7ce9f51eb0416ced11bf65c5efdbe7ce91948a9a26' 
  AND token = 'eFTvvd9ixpadsST6uTjBRVvPeHRtU+Ikc75zG5eMaD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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